Rare B decays and CP-Violation in the B system with the ATLAS Detector

A search for the rare decay Bs0 → µ+µ− has been performed with the ATLAS detector at the Large Hadron Collider LHC in proton-proton collisions at a centre of mass energy of √s
= 7 TeV using 2.4 fb−1 of integrated luminosity. The observed number of signal events is consistent with the background expectations and the resulting upper limit on the branching fraction is set to ℬ(Bs0 → µ+µ−) < 2.2(1.9) × 10−8 at 95% (90%) confidence level. A time dependent measurement of CP-violation in the exclusive decay channel Bs0 → J/ψ(µ+µ−)ϕ(K+K−) has been performed with an integrated luminosity of 4.9 fb−1 at an energy of √s
= 7 TeV. The resulting measurements of the CP-violation weak mixing phase ϕs = 0.22 ± 0.41 (stat.) ± 0.10 (syst.) rad and the decay width difference ΔΓs = 0.053 ± 0.021 (stat.) ± 0.008 (syst.) ps−1 are consistent with the theoretical predictions of the Standard Model and the world average values.

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